The secret Pokemon house is in the safari zone in fuchsia city. I used a very useful website to get to the secret house inside of the safari zone and it told me where I had to go. Use the link at the bottom and it'll tell you exactly where to go inside the safari zone to get to the secret Pokemon House. Once you are in the secret Pokemon house you will see a guy. talk to him and he'll give you the HM03 (Surf).
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You must enter the house above the lab then you look for the secret key. that unlocks the gym You must enter the house above the lab then you look for the secret key. that unlocks the gym
From the centre to the first to the second than you also find the golden theeth(you must give the theeth to Warden in the house right of the Pkmn Centre) than down and than you found the seceret house!!!!
You don't! There is no secret house! But there is a secret potato that you can find by pressing the lawn chair button on your controller. If that dosen't exsist on your device then boo hoo for you!
The Blue switch is located on the Water level's secret area from Ilusion Forest.
I don't think there is one..